Bosch 8 pieces SDS Masonry drill bit set for use in concrete and general masonry 5.0mm - 10.0mm x 160mm length, supplied in sturdy plastic case. Carbide tipped drill bit and 4-fold spiral flute for rapid drilling. The SDS plus-3 Drill Bit offers durability when drilling in concrete. To prevent heat development, the 4-flute dura design provides effective dust removal for increased endurance. It is made of high-alloy steel, which is produced with an optimised hardening technology to withstand wear. For additional resistance, indented cutting edges are made from an ideal Bosch-controlled carbide blend. As proof of quality, the drill bit bears the test mark of the PGM Masonry Drill Bit Association Board, guaranteeing compliance with tight tolerances, exact drilling and the firm hold of.